Ohhh! I know exactly what you mean! What you do is, you open your extracts b4a0 or 14f51 in Hex Editor (I prefer HxD). Then rename it! Make sure you delete all the code in there. And the new GSC name has to be just as long as the old gsc name... like for example...

mp/gametypes/_utility.gsc

that's 25 characters, so if you renamed it, it would have to be 25 characters like so:

mp/gametypes/CoolStory.gsc

do you get me?

Look at this thread I made a while back it answers all your questions :p

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also, you can't add a file... you can only rename, and edit

sorry but that didnt answer my question i wanted to add a new .gsc like elitemossy with mossyfunctions but thanks anyway

Yeah lol,
First you open _missions and delete everything from it. Then you Save As it and save it to YOUR.GSCNAMEHERE And put it where you want.